code: def open(
      self, path: str, mode: str = "r", buffer_size: int = 8192
  ) -> io.IOBase:
      raise NotImplementedError
  
file_path: hail/hail/python/hailtop/fs/fs.py
imports: import abc
  from typing import List
  import io
  from .stat_result import FileListEntry
label_desc: Use image node_id 1 for calling the FS obj's underlying member method code with example usage: obj.open(path, mode, buffer_size) without return types